I was hoping to get some information from the more knowledgeable on here about which nMP would provide the most "bang for the buck" if all I would want the performance for is editing photos in Lightroom and very occasional Photoshop work. Currently I do all my LR work on my 15" rMBP (top end from the initial release) as it is much faster than my 2010 iMac. However, I'd like to setup a better desktop solution and hope to drive a 4K display in the future on it either one of the new Dells or a future 4K Apple Display if it comes to market. Correct me if I'm wrong, but I understand that LR and PS mostly only use CPU power and are not benefited by GPU very much if at all. Mostly I just want to speed up my import where I have LR generate 1:1 previews and also to move between modules and just overall speed up the LR process. Would the lowest nMP config be a reasonable alternative, or would there be a justifiable gain to spend more and move up to a higher end version? If so, what upgrades would benefit my use the most? Thanks for any suggestions or just give me a good schooling!!